To safely and quickly kill an enforcer for the blueprint, use bolas, if you're just starting, instead of going melee when it's stuck, shoot arrows at it's face... If it works for me, it can work for you
Bola low lv that are away for other enforcers kill and harvest for the oil and dust. Harvest lamppost for dust. Lead corrupt Dino into enforcers and other Dinos or kill them yourself for corrupted nodes. KEEP IN MIND CORRUPT DINOS BODYS DESPOND FAST
The blueprint says you need a tek replicator but fortunately you can make them with the city terminals that you can find in the sanctuary. You can get oil from killing enforcers. You can get dust from enforcers or harvest from lampposts. For polymer, use corrupted nodules.
Best way to decide whether or not you can kill one depends on if your dino is bigger than it, and if its a carnivore. If both are no, kill with caution. Also, any mid to end game "fliers" will work(wyverns, manas, rock drakes, etc.).